CAT Engine Fault Codes List: 3493-13 to 543-3
Page 5 of 12 of the full CAT Engine fault code list (1,341 codes). Each entry is the code as the machine reports it and what the manufacturer data says it means.
CAT Engine codes 3493-13 to 543-3
- 3493-13Aftertreatment #1 Secondary Air Pressure Sensor : Calibration Required
- 3493-21Aftertreatment #1 Secondary Air Pressure Sensor : Data Drifted Low
- 3493-3Aftertreatment #1 Secondary Air Pressure Sensor : Voltage Above Normal
- 3493-4Aftertreatment #1 Secondary Air Pressure Sensor : Voltage Below Normal
- 3511-13Engine Exhaust Gas Recirculation Outlet Pressure : Calibration Required
- 3511-21Engine Exhaust Gas Recirculation Outlet Pressure : Data Drifted Low
- 3511-3Engine Exhaust Gas Recirculation Outlet Pressure : Voltage Above Normal
- 3511-4Engine Exhaust Gas Recirculation Outlet Pressure : Voltage Below Normal
- 3512-5Engine Exhaust Back Pressure Regulator Control Command : Current Below Normal
- 3512-6Engine Exhaust Back Pressure Regulator Control Command : -Current Above
- 3513-3Engine Exhaust Back Pressure Regulator Valve Position Sensor : Voltage Above Normal
- 3513-4Engine Exhaust Back Pressure Regulator Valve Position Sensor : Voltage Below Normal
- 3528-13Barometric Pressure : Out of Calibration
- 3528 -21Atmospheric Pressure Sensor : Calibration Required
- 3528-3Engine Air Filter 1 Differential Pressure : Voltage Below Normal
- 3528-4Atmospheric Pressure Sensor : Voltage Below Normal
- 3547-3Water in Fuel System Switch : Voltage Above Normal
- 3547-4Water in Fuel System Switch : Voltage Below Normal
- 3607-5Aftertreament #1 Diesel Exhaust Fluid Pump Heater : Current Below Normal
- 3607-6Aftertreatment #1 Diesel Exhaust Fluid Pump Heater : Current Above Normal
- 3609-11Aftertreatment #1 Outlet #1 NOx Level Sensor : Other Failure Mode
- 3609-5Aftertreatment #1 Outlet #1 NOx Level Sensor : Current Below Normal
- 3609-6Aftertreatment #1 Outlet #1 NOx Level Sensor : Current Above Normal
- 3612-11Engine Exhaust Nox Level Sensor Power Supply - Other Failure Mode
- 3619-11Aftertreatment #1 Outlet #1 NOx Level Sensor Power Supply : Other Failure Mode
- 3621-11Aftertreatment #1 Intake Gas Sensor Power Supply : Other Failure Mode
- 363-5Machine Ride Control Actuator Current Below Normal
- 363-6Ride Control Solenoid Short to Ground
- 3655-11Aftertreatment #1 Intake NOx Level Sensor : Other Failure Mode
- 3655-12Aftertreatment #1 Intake NOx Level Sensor : Failure
- 3666-5Engine Electric Lift Pump For Engine Fuel Supply : Current Below Normal
- 3666-6Engine Electric Lift Pump For Engine Fuel Supply : Current Above Normal
- 367-2Ride Control Switch Erratic, Intermittent, or Incorrect
- 3683-3Auxiliary Temperature Sensor #2 : Voltage Above Normal
- 3683-4Auxiliary Temperature Sensor #2 : Voltage Below Normal
- 3782-3Engine Turbocharger Turbine Outlet Temperature Sensor : Voltage Above Normal
- 3782-4Engine Turbocharger Turbine Outlet Temperature Sensor : Voltage Below Normal
- 3782-8Engine Turbocharger Turbine Outlet Temperature Sensor : Abnormal Frequency, Pulse Width, or Period
- 3820-12Aftertreatment #1 Diesel Exhaust Fluid Controller : Failure
- 3820-14Aftertreatment #1 DEF Controller : Special Instruction
- 3820-3Aftertreatment #1 Diesel Exhaust Fluid Controller : Voltage Above Normal
- 3820-4Aftertreatment #1 Diesel Exhaust Fluid Controller : Voltage Below Normal
- 3820-9Aftertreatment #1 Diesel Exhaust Fluid Controller : Abnormal Update Rate
- 3821-11Aftertreatment #1 Diesel Exhaust Fluid Dosing Valve Actuator : Other Failure Mode
- 3821-14Aftertreatment #1 Diesel Exhaust Fluid Dosing Valve Actuator : Special Instruction
- 3821-6Aftertreatment #1 Diesel Exhaust Fluid Dosing Valve Actuator : Current Above Normal
- 3821-7Aftertreatment #1 Diesel Exhaust Fluid Dosing Valve Actuator : Not Responding Properly
- 3822-5Aftertreatment #1 Diesel Exhaust Fluid Line Heater Relay : Current Below Normal
- 3822-6Aftertreatment #1 Diesel Exhaust Fluid Line Heater Relay : Current Above Normal
- 3838-5Aftertreatment #1 Diesel Exhaust Fluid Dosing Control Module Relay : Current Below Normal
- 3838-6Aftertreatment #1 Diesel Exhaust Fluid Dosing Control Module Relay : Current Above Normal
- 3862-5Aftertreatment #1 Diesel Exhaust Fluid Return Valve Solenoid : Current Below Normal
- 3862-6Aftertreatment #1 Diesel Exhaust Fluid Return Valve Solenoid : Current Above Normal
- 3862-7Aftertreatment #1 Diesel Exhaust Fluid Return Valve Solenoid : Not Responding Properly
- 3956-3Aftertreatment #1 Diesel Oxidation Catalyst Intake Gas Temperature : Voltage Above Normal
- 3956-4Aftertreatment #1 Diesel Oxidation Catalyst Intake Gas Temperature : Voltage Below Normal
- 3965-5Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #1 : Current Below Normal
- 3965-6Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #1 : Current Above Normal
- 3966-5Aftertreatment 1 Diesel Exhaust Fluid Control Module Power Supply 2 : Current Below Normal
- 3966-6Aftertreatment #1 Diesel Exhaust Fluid Control Module Power Supply #2 : Current Above Normal
- 411-15High EGR Differential Pressure
- 411-17Low EGR Differential Pressure
- 4193-0Engine Coolant Pump Outlet Temperature : High - Most Severe (3)
- 4193-2Engine Coolant Pump Outlet Temperature : Erratic, Intermittent, or Incorrect
- 4193-3Engine Coolant Pump Outlet Temperature : Voltage Above Normal
- 4193-4Engine Coolant Pump Outlet Temperature : Voltage Below Normal
- 42-11Inject Actuation Control Valve Open/Short
- 444-5Engine Starter Motor Relay : Current Below Normal
- 444-6Engine Starter Motor Relay : Current Below Normal
- 4550-5Electric Fuel Transfer Pump Relay : Current Below Normal
- 4550-6Electric Fuel Transfer Pump Relay : Current Above Normal
- 4592-2Aftertreatment 1 Outlet NH3 Gas Sensor Power In Range : Erratic, Intermittent, or Incorrect
- 4594-3Electric Fuel Transfer Pump Outlet Pressure Sensor : Voltage Above Normal
- 4594-4Electric Fuel Transfer Pump Outlet Pressure Sensor : Voltage Below Normal
- 460-10Fuel Pressure Sensor - After Fuel Filter : Abnormal Rate of Change
- 460-13Fuel Pressure Sensor - After Fuel Filter : Calibration Required
- 460-2Filtered Fuel Pressure Misinstalled
- 460-21Fuel Pressure Sensor - After Fuel Filter : Data Drifted Low
- 460-9Fuel Pressure Sensor - After Fuel Filter Abnormal Update Rate
- 4648-3Aftertreatment Ambient Air Temperature Sensor : Voltage Above Normal
- 4648-4Aftertreatment Ambient Air Temperature Sensor : Voltage Below Normal
- 485-3Engine Fan Rev Solenoid Short to +Batt
- 485-4Engine Fan Rev Solenoid Short to Ground
- 486-2Engine Fan Reverse Switch Inputs Incorrect
- 486-3Engine Fan Reverse Switch : Voltage Above Normal
- 486-4Engine Fan Reverse Switch : Voltage Below Normal
- 51Intermittent Battery Power to ECM
- 526-11Wastegate Valve open/short
- 526-5Engine Turbocharger #1 Wastegate Drive : Current Below Normal
- 526-6Engine Turbocharger #1 Wastegate Drive : Current Above Normal
- 526-7Turbo Wastegate Drive not responding properly
- 53ECM Fault
- 533-14Brake Control : Special Instruction
- 533-9Brake Control : Abnormal Update Rate
- 542-10Engine Oil Pressure Sensor - Before Oil Filter : Abnormal Rate of Change
- 542-13Unfiltered Engine Oil Pressure cal required
- 542-2Unfiltered Engine Oil Pressure Misinstalled
- 542-3Engine Oil Pressure Sensor - Before Oil Filter : Voltage Above Normal
- 542-4Engine Oil Pressure Sensor - Before Oil Filter : Voltage Below Normal
- 543-3Engine Oil Pressure Sensor - After Oil Filter : Voltage Above Normal
Other Caterpillar machine types
Fault code lists by brand
- Volvo6,508 codes
- New Holland Tractor3,475 codes
- FPT3,033 codes
- Case IH2,992 codes
- Bobcat2,653 codes
- Challenger Tractor2,434 codes
- New Holland Combine2,274 codes
- John Deere Tractors1,884 codes
- Case Wheel Loader1,859 codes
- John Deere Engines1,853 codes
- Cummins1,847 codes
- Challenger Rubber Track Tractor1,747 codes
- Volvo Wheel Loader1,726 codes
- Deutz1,684 codes
Safety-critical: confirm before use
Safety first: park on level ground, stop the engine, and secure the machine before any inspection. Thresholds, component locations, wire numbers, fuse locations, and reset procedures can vary by model, configuration, and serial number. Confirm them in the service documentation for your exact machine.